Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef89fe161b62c1a1…

MALICIOUS

PDF

96.3 KB Created: 2021-07-13 03:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 317bc18ae3abe98a1321c7615af4569b SHA-1: 3e2a7da9c5785e6bd625e0a41c7a879e2d986274 SHA-256: ef89fe161b62c1a1566ee9faeb32ae34c0b1a8724c2947fee6154063135d8d7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=prisoners+workout+everyday PDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3dd20ea4---woxidokulupew.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/dipupidimabe.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/jetosozojepemugamavog.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/17814221491.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/ditanudoxinunaworirojaj.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/pujuparoviwo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/011f8254d66c395e4bce063547e3bb27/53232618034.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff440ebe6f---46525666631.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/27753223165.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7453b3b13---43246986099.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed811502b---xezumakixelutonufadabisex.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160df7d3f5f34b---74723737938.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/kufetutepapedituzonuvuf.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/56f31c7eec5746415ef36d70e99e57c1/lakanosugufazom.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/budopuzemixuvejalefiloma.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b263c1c12---xatofibasulupivudaf.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210615_55F62ABDDEAA7F5B.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/58825184653.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79338ae6cd---30588294638.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608329b918571---42814715648.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1c29157e5---girujudakegezafoxutex.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608886c8570a7---tilexokuxema.pdfIn PDF document text
    • http://caramelitos.sk/files/rukisovisovikazukobokuzo.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/pirabimutipexefusepo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 17140 bytes
SHA-256: 65afca329dcf75042b10fe3ae67a1944c8ac6cae0ce051b03773e8efad0ac82d
font_01_sfnt_off0001435e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435E 10652 bytes
SHA-256: e79f801dbf0dcfb0ba24be62b4c98f254c751ba9b0c13dac8643e712812d4f86
font_02_sfnt_off00015bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.